diff --git a/script/MultiRegionScan.py b/script/MultiRegionScan.py
index c8489808..fba8c866 100644
--- a/script/MultiRegionScan.py
+++ b/script/MultiRegionScan.py
@@ -72,11 +72,15 @@ class ImageReader(ReadonlyRegisterBase, ReadonlyRegisterMatrix):
         ny = Scienta.slices.read()
         return ny
 
+global scan_index
 scan_index = -1
 
 def do_scan(motors, positions, regions, latency):
-    sensors = [SampleCurrent, RefCurrent]
+    global scan_index
+    global SENSORS
+    
     scan_index += 1
+    SENSORS = [SampleCurrent, RefCurrent]
     
     for (index, region) in enumerate(regions):
         reader = SpectrumReader()
@@ -85,19 +89,19 @@ def do_scan(motors, positions, regions, latency):
         reader.region = region
         reader.initialize()
         set_device_alias(reader, "ScientaSpectrum{0}".format(index + 1))
-        sensors.append(reader)
+        SENSORS.append(reader)
 
         image = ImageReader()
         image.region_index = index
         image.region = region
         image.initialize()
         set_device_alias(image, "ScientaImage{0}".format(index + 1))
-        sensors.append(image)
+        SENSORS.append(image)
 
     adjust_sensors()
     set_adc_averaging()
 
-    vscan(motors, sensors, positions, True, latency,False, before_read=wait_beam, after_read = after_readout)
+    vscan(motors, SENSORS, positions, True, latency,False, before_read=wait_beam, after_read = after_readout)
 
 
 try: